linux-kernel - Re: RFC: Self-snapshotting in Linux

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Date:	Thu, 17 Apr 2008 11:32:35 +0200
From:	Pavel Machek <pavel@....cz>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: RFC: Self-snapshotting in Linux

On Wed 2008-04-16 14:50:46, Alan Jenkins wrote:
> Pavel Machek wrote:
>>> I guess there is the hardware / drivers issue.  I would like to claim
>>> I've found hibernation to be reliable but unfortunately that's not
>>> 100% true.
>>>     
>> So debug it, it is open source after all. Or at least file a bugs.
>>   
> I definitely want to debug it; I love hibernating.  It's a regression and 
> it'll affect my distro kernel once I upgrade to Ubuntu Hardy.
>
> <http://bugzilla.kernel.org/show_bug.cgi?id=10196> "Backtraces during 
> hibernate / resume".
>
> I posted the backtraces but nobody could tell me what they were - they 
> don't actually say whether they're OOPs or BUGs etc.  They might be 
> softlockups - some times I got softlockup warnings, though thats not in the 
> log I posted.

Not sure what that is, I never seen that before.

Can you try vanilla 2.6.25-rc9 or something?

> I'm confused about some details (exactly which versions / configs produced 
> which symptoms).  I don't have the machine right now, but I'll get back to 
> it some time soon.  I think I managed to get a pair of broken and 
> non-broken kernels to work on, and it seems to be a regression going from 
> 2.6.22 to 2.6.23.

If you can do a git bisect between those two, we could probably fix it
very quickly.

> Any help in clearing up my confusion would be appreciated.  Is it worth 
> trying to narrow down exactly where the hang happens between writing the 
> hibernation image and shutting down?  If so how?  I suspect that's going to 
> be easier than bisecting it.

Adding printks?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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